[lproven]

Mozilla Thunderbird does that, with the older, pre-Markdown, internet-standard version.

Which also works in Facebook Messenger and in WhatsApp, which very few people seem to know.

[gglitch]

I'm sorry, but searching the documentation (and the internet) is failing me - would you please provide an example or link? Thank you.

[lproven]

Blimey. People really won't take your word online these days.

OK, here, I made you a screenshot.

https://imgur.com/a/frml6cs